Im working on a McCormick Deering cream separator and all the bearings are N.D. 3024's, any idea what this N.D. Stands for or the company? Hoping to cross it over to something I can get new. Thanks in advance.

Motion industries in town here, I walked in took the little girl 3 minutes and she crossed the part numbers over. Ordered them be in at 9 am tomorrow, they were around $5 each I was very pleased I'd looked for 2 days online trying to cross them over. Thanks all